Oddly enough, I'm most uncomfortable at the surface of the water. I guess I have a male athletic build from years of running and martial arts. So, my center of gravity is quite high. At the surface my legs keep floating up. If behind me, they will bend at my knees and tip me face down. I can lay on my back but I really don't want to have to rely on being in that position. Thing is, I don't see anyone else with this struggle. I've used ankle weights but instructors seem opposed to this solution and keep telling me to relax. I AM relaxed...except for the fact that I can be comfortable at the surface. Ive been in the pool or ocean at least 25 times and this remains a problem. Suggestions?